Ear muff



FIG. 1 is a perspective view of an ear muff, showing my design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines shown in the drawings represent portions of the ear muff that form no part of the claimed invention. 

CLAIM The ornamental design for an ear muff, as shown and described. 